code: def __convert_audio(in_path, out_path):
      """
      Helper function that's called per thread, converts sph to wav.
      Args:
          in_path: source sph file to convert
          out_path: destination for wav file
      """
      cmd = ["sph2pipe", "-f", "wav", "-p", in_path, out_path]
      subprocess.run(cmd)
  
file_path: NeMo/scripts/dataset_processing/fisher_audio_to_wav.py
imports: import argparse
  import concurrent.futures
  import glob
  import logging
  import os
  import subprocess
  from tqdm import tqdm
label_desc: Use image node_id 1 for calling a global function with example usage: __convert_audio(in_path, out_path) without return types